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 #include &lt;QtGui&gt;

 #include &lt;math.h&gt;
 #include &lt;stdlib.h&gt;

 #include &quot;extrafiltersplugin.h&quot;

 QStringList ExtraFiltersPlugin::filters() const
 {
     return QStringList() &lt;&lt; tr(&quot;Flip Horizontally&quot;) &lt;&lt; tr(&quot;Flip Vertically&quot;)
                          &lt;&lt; tr(&quot;Smudge...&quot;) &lt;&lt; tr(&quot;Threshold...&quot;);
 }

 QImage ExtraFiltersPlugin::filterImage(const QString &amp;filter,
                                        const QImage &amp;image, QWidget *parent)
 {
     QImage original = image.convertToFormat(QImage::Format_RGB32);
     QImage result = original;

     if (filter == tr(&quot;Flip Horizontally&quot;)) {
         for (int y = 0; y &lt; original.height(); ++y) {
             for (int x = 0; x &lt; original.width(); ++x) {
                 int pixel = original.pixel(original.width() - x - 1, y);
                 result.setPixel(x, y, pixel);
             }
         }
     } else if (filter == tr(&quot;Flip Vertically&quot;)) {
         for (int y = 0; y &lt; original.height(); ++y) {
             for (int x = 0; x &lt; original.width(); ++x) {
                 int pixel = original.pixel(x, original.height() - y - 1);
                 result.setPixel(x, y, pixel);
             }
         }
     } else if (filter == tr(&quot;Smudge...&quot;)) {
         bool ok;
         int numIters = QInputDialog::getInteger(parent, tr(&quot;Smudge Filter&quot;),
                                     tr(&quot;Enter number of iterations:&quot;),
                                     5, 1, 20, 1, &amp;ok);
         if (ok) {
             for (int i = 0; i &lt; numIters; ++i) {
                 for (int y = 1; y &lt; original.height() - 1; ++y) {
                     for (int x = 1; x &lt; original.width() - 1; ++x) {
                         int p1 = original.pixel(x, y);
                         int p2 = original.pixel(x, y + 1);
                         int p3 = original.pixel(x, y - 1);
                         int p4 = original.pixel(x + 1, y);
                         int p5 = original.pixel(x - 1, y);

                         int red = (qRed(p1) + qRed(p2) + qRed(p3) + qRed(p4)
                                    + qRed(p5)) / 5;
                         int green = (qGreen(p1) + qGreen(p2) + qGreen(p3)
                                      + qGreen(p4) + qGreen(p5)) / 5;
                         int blue = (qBlue(p1) + qBlue(p2) + qBlue(p3)
                                     + qBlue(p4) + qBlue(p5)) / 5;
                         int alpha = (qAlpha(p1) + qAlpha(p2) + qAlpha(p3)
                                      + qAlpha(p4) + qAlpha(p5)) / 5;

                         result.setPixel(x, y, qRgba(red, green, blue, alpha));
                     }
                 }
             }
         }
     } else if (filter == tr(&quot;Threshold...&quot;)) {
         bool ok;
         int threshold = QInputDialog::getInteger(parent, tr(&quot;Threshold Filter&quot;),
                                                  tr(&quot;Enter threshold:&quot;),
                                                  10, 1, 256, 1, &amp;ok);
         if (ok) {
             int factor = 256 / threshold;
             for (int y = 0; y &lt; original.height(); ++y) {
                 for (int x = 0; x &lt; original.width(); ++x) {
                     int pixel = original.pixel(x, y);
                     result.setPixel(x, y, qRgba(qRed(pixel) / factor * factor,
                                                 qGreen(pixel) / factor * factor,
                                                 qBlue(pixel) / factor * factor,
                                                 qAlpha(pixel)));
                 }
             }
         }
     }
     return result;
 }

 Q_EXPORT_PLUGIN2(pnp_extrafilters, ExtraFiltersPlugin)</pre>
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